Thursday, July 31, 2014

Meteor falls over Ontario

TORONTO—Dozens of residents in southern Ontario said thought they saw a meteor streak across the sky yesterday afternoon, and an expert said there is little doubt that is what they spotted.
“There are dash-cam videos I’ve seen already posted to the Internet that . . . clearly show what I would say is unequivocally a meteor,” said Peter Brown, a professor at the University of Western Ontario who studies meteors and meteorites.

Many Ontarians took to social media or contacted the American Meteor Society to report either a flash of light or a loud rumble.
The reports came in from various southern Ontario communities and parts of the U.S.
The meteor society posted a comment from a person who said he was from Toronto and described a bright flash.
“It was as fast as a shooting star,” said the poster, who identified himself as “Doug C.”
“It was as bright, if not brighter, than a lightning bolt.”
Dana Petrillo, of Cobourg, Ont., tweeted that her house vibrated and that she first thought there had been an earthquake or explosion.
“It was a really low rumble that just reverberated through the walls,” she recalled.
“It really wasn’t a shaking, like in an earthquake, but more like a wave.
“It really did feel like an explosion,” she added in an e-mail.
Most of the equipment the university has to track meteors was not in operation yesterday afternoon, but a series of microphones the university has in place did detect a shockwave, Brown noted.
Based on the data and the eyewitness reports, it appears the shockwave occurred in the area of Peterborough, Ont.
And its characteristics allowed for an estimate of the size of the meteor, noted Brown.
“The energy is somewhere in the order of a few tens of tons of TNT explosive equivalent,” he said in an interview from London, Ont. last night.
“That would translate into something on the order of half- to one-metre in diameter and that’s going to be a mass of . . . a few metric tons.”
It’s possible some fragments hit the ground, Brown added.
“This clearly was a pretty massive event, lots of mass, so on that basis alone, I think we have a pretty good chance that meteorites would make it to the ground,” he remarked.
The odds of fragments hitting the ground depend on how fast the meteor was travelling—a relatively slow-moving fireball would make it more likely that some meteorites may be found.
“It would not surprise me if meteorites are found,” Brown said.

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